genetic sequence example

The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between sequences. A cDNA rather than a gDNA library was constructed to remove pseudogene sequences … sequences Human Chromosome #2 shows the exact point at which this fusion took place centromere #12 (active) Hillier et al (2005) “Generation and Annotation of the DNA sequences of human chromosomes 2 and 4,” Nature 434: 724-731. For example UGG encodes for Trp (Tryptophan). In 1964, Richard Holley who performed the sequencing of the tRNA was the first attempt to sequence the nucleic acid. You can then find out whether there is an Ensembl gene in that area. The sequence of nucleotides in DNA determines the sequence of amino acids found in all proteins. Full genome sequencing can reveal the approximately 13,500-letter sequence of all the genes of the virus’ genome. Random sequences can be used to evaluate the significance of sequence analysis results. The start of the sequence is marked by a line starting with "SQ" and the end of the sequence is marked by two slashes ("//"). The Genetic Code. The genetic code is almost universal. The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance of matches. For example, one DNA base in a gene might get substituted for another. Genetic Variation: Importance, Sources, and Examples. As a leader in R&D genomics services, GENEWIZ provides superior data and high-quality constructs for next generation sequencing, gene synthesis, and sanger sequencing. It gives a “yes or no” answer. Some of it matters. Step 3– Sequencing your DNA. Genomics, is, therefore, the study of the genetic make-up of organisms. gene = a region identified as a gene. Gene Sequence. For example, some variants alter a gene's DNA sequence but do not change the function of the protein made from the gene. For example, the E. coli bacterium carries its genetic instructions in a DNA molecule that contains more than five million nucleotides. Examples of epigenetics Epigenetic changes alter the physical structure of DNA . Sequences in the NCBI Sequence Database (or EMBL/DDBJ) are identified by an accession number. These are called silent mutations. Next generation sequencing is a type of diagnostic technology that can determine, among other things, the genetic sequence of a virus. 2011; McCormack et al. Research Real-time DNA and RNA sequencing — from portable to high-throughput devices. The sequencing of an entire genome is not yet, however, a routine technique, and other methods of genetic analysis are used to quickly and effectively analyze DNA samples. For example, one exception is RNA from mitochondrial DNA, where both UGG and UGA encode Trp. Genetic Makeup of the COVID-19 Virus A global pandemic, caused by a novel coronavirus (SARS-CoV-2, previously known as 2019-nCoV), the coronavirus disease 2019 (COVID-19) originated in China few months back costing millions of people suffering physically, emotionally and financially. Whole exome sequencing (WES) is available to patients who are searching for a unifying diagnosis for multiple medical issues. But DNA sequences are the most widely used. Sequence Manipulation Suite: Random Protein Sequence. By sequencing your genome, health professionals can look at the unique variations found in your genes. If a transmembrane domain is found in a gene of unknown function, it suggests that the … dimensional shape of the protein. The RGC and The Florey Institute of Neuroscience and Mental Health are collaborating to whole exome sequence and study the genetic basis of more than 3,000 onset cases of MS patients and controls to identify genes that are associated with disease susceptibility and/or sub-phenotypes. With any sample type, quality is paramount to generate the best sequencing results and subsequently to produce the most accurate data. This change can affect a single nucleotide pair or larger gene segments of a chromosome. These variations in gene sequences can sometimes be advantageous to an organism. Whole Genome Sequencing (WGS) is a comprehensive test that covers up to 98% of the whole human genome. Sample Type is … ShortSeq Plate (Premix Samples only)—formerly Express Plates**. The human genome project was completed in 2013, it takes almost 10 years to complete the entire genome sequencing of us.. Microbiome database involves the sequencing resource and metadata of ecological community samples of microorganisms, including both host-associated or environmental microbes. Random DNA Sequence generates a random sequence of the length you specify. A mutation is a random, unpredictable change in the DNA in a cell. ALS genes conform to a basic three-domain structure that includes a relatively conserved 59 domain of 1299 to 1308 nucleotides (433 to 436 amino acids), a central domain of variable length consisting entirely of a tandemly repeated 108-bp motif, and a 39 domain of variable length and sequence that encodes a serine-threonine-rich protein (Hoyer et al. This free DNA template slide design can be used for presentations on bioinformatics as well as other biologic presentations or Genetics slide design. Purified PCR product. Unlike older technology where only one gene could be tested at a time, Baylor Genetics uses state-of-the-art technology to study a person’s exome. DNA sequencing is a technique that is used to discover the sequences of nucleotides within a DNA molecule. This is an extremely important task because DNA stores the genetic material of an organism. All genetic information is coded into DNA by the arrangements of four nucleobases, adenine, cytosine, guanine, and thymine. Aberrations within tumor suppressor genes can lead to cancer, thus it is important that their sequences remain unaltered. 2013; Hearn et al. The four DNA nucleotide bases - A, T, G, and C - (or A, U, G, C in RNA) can be arranged as 3-base long With genetic testing, you can discover how DNA might affect your ability to match a musical pitch, or even whether you hate the sound of chewing. Simply put: if you use 16S sequencing, there is a large chance that your sequence will be present in the 16S database, making it easy to identify to which bacteria or archaea the gene belongs. As DNA polymerase copies the DNA sequence, some mistakes occur. The most obvious difference is that in the DNA replication, the new DNA string elongated contains thymine that binds adenine, but, in transcription, the RNA produced contains uracile instead of thymine. Genetic Code. Fasta format. Include the organism in the search to find the most relevant results and filter for transcript sequences, for example: Cytochrome c AND … ­In the h­uman genome, there are 50,000 to 100,000 genes. Gene sequences represent less than 3% of the total human genome and various methods have been employed to identify the presence of coding sequences in genomic DNA. Unlike genetic changes, epigenetic changes are reversible and do not change your DNA sequence, but they can change how your body reads a DNA sequence. For Single Cell 3' v2 libraries, we recommend 50,000 read pairs/ cell. If you do not have a gene name, an ID, or an accession number for your sequence of interest, Ensembl provides an interface that allows you to use BLAST or BLAT to align your sequence to the genome. History of DNA sequencing: The story of DNA begins when Watson and Crick discovered the structure of DNA in the year 1953. Results of translation. It is a method of converting a long one-dimensional sequence (in our case a genetic sequence) into a graphical form. We compared M. tuberculosis whole genome sequences generated from 33 paired clinical samples using two methods. 16s rRNA gene sequencing studies as opposed to the more cumbersome manipulations involving DNA-DNA hybridization investigations. 1998b). Determining the genomic sequence, however, is only the beginning of genomics. Sequencing of fetal genomes using only maternal blood sample ... or the father may be unavailable or unwilling to provide a sample. Atomic sequences can be connected by link element and they will lead to sequence graph. coding regions) as there may, also be promoters, tandem repeats, introns, etc. • Gene sequencing = DNA sequencing = nucleotide sequencing = base sequencing • However, not all DNA sequences are genes (i.e. Mutations can be passed down to a child from his or her parents. Manitoba is now sending COVID-19 samples for genetic sequencing to detect variants within 24 hours, but officials still have no explanation for previous delays in … DNA Mutation, Variation and Sequencing. Some doesn’t matter. In the above example (BRCA2), a CpG island is displayed in the proximal promoter. Save for later. 2014). As an example, there is a group of genes that not only have been used in evolutionary studies, but also have a significant impact on human health: the tumor suppressor genes. Able to sequence all Cellecta libraries and a range of other pooled lentiviral libraries, such as Brunello, GecKO, etc. So, primer sequence atgcgtccggcgtagag means 5’ atgcgtccggcgtagag 3’. Send primer pair sequences from Primer-BLAST runs in Sequencher Connections to your Sequencher project. The human genome (all the DNA of an organism) consists of around three billion nucleotides divided up between 23 paired DNA molecules, or chromosomes . Step 1: Enter some information about your samples. A gene mutation is a change in the sequence of nucleotides that may result in an altered polypeptide. Various species have different patterns of codon usage. Gene Expression. There are many other chromosomal abnormalities including: … Determining the similarity between two sequences is a common task in computational biology. DNA consists of a polymer of nucleotides joined together. Get results from gene screens with pooled CRISPR, shRNA, and barcode libraries faster by letting Cellecta do the NGS prep, sequencing, and analysis. The genetic services of Blueprint Genetics were highly professional. The MiniSeq, Illumina's latest benchtop sequencer, enables more cost-efficient DNA sequencing relative to larger Illumina sequencing platforms ( e.g., MiSeq). Gene sequencing is a process in which the individual base nucleotides in an organism's DNA are identified. This technique is used to learn more about the genome of the organism as a whole, and to identify specific areas of interest and concern. A number of different techniques can be used,... Variations in the sequence of genes during can have important consequences and cause disease. It is frequently used to find optimal or near-optimal solutions to difficult problems which otherwise would take a lifetime to solve. 16S rRNA gene sequencing and IS-pro analyses shows that the vast majority of microbiota profiles have a similar Shannon diversity index (Fig. However, when the DNA sequence at the breakpoints for these events is analyzed, short regions of sequence similarity are found in some cases. RNA is composed of four nucleotides: adenine (A), guanine (G), cytosine (C), and uracil (U). DNA exists as a code, or more specifically a sequence, using four molecules called nucleotide bases. In quickly moving developments last night, health officials from Wuhan, China, posted a novel coronavirus (nCoV) pneumonia outbreak update, which scaled back the number of cases to 41 and noted the first death, and researchers from China released the genetic sequence of the nCoV. Beware some genes have alternative promoters. Solid-phase (NimbleGen) or … To assess the feasibility of target-enrichment and massively parallel sequencing technologies to interrogate all exons of all genes implicated in NSHL, we tested nine patients diagnosed with hearing loss. For each cluster that passes filter, a single sequence is written to the corresponding sample’s R1 FASTQ file, and, for a paired-end run, a single sequence is also written to the sample’s R2 FASTQ file. It is most often used in medical research and is beginning to be used more in cli… Background: Genetic profiling of resected tumor or biopsy samples is increasingly used for cancer diagnosis and therapy selection for thyroid and other cancer types. Once sequencing is complete, results are assembled into a contiguous (contig) sequence using one of several available software programs as shown in figure 2. An example sequence in GenBank format is: LOCUS AB000263 368 bp mRNA linear PRI 05-FEB-1999 DEFINITION Homo sapiens mRNA for … Unpurified PCR product. NGS enables researchers to sequence and analyze genomic information, and could help determine which host genetic factors impact susceptibility and severity of COVID-19. Three adjacent nucleotides constitute a unit known as the codon, which codes for an amino acid. The way the lab looks at your DNA will depend on the type of genetic test your doctor ordered. Gene Assembly: Assembling Sequence Results. For example, the sequence AUG is a codon that specifies the amino acid methionine. This change in sequence can change the way that the gene works, for example by changing the protein that is made. For example, people with a particular genetic condition may show symptoms similar to yours. During protein synthesis, DNA is transcribed into RNA and then translated to produce proteins. Sometimes, because of new or inherited genetic mutations, your genes can cause a disease or increase your risk for disease. D. Differential codon usage . Although mutations occur in cell DNA and are typically detected using DNA sequencing, recent attempts focused on detecting pathogenic variants from RNA. The UniGene cluster has links to transcript sequences for the gene from the Nucleotide and EST databases; If there is no UniGene cluster for this gene and organism, perform a search in the Nucleotide database with the gene name, product name, or symbol. About sequence notation: Standard notation of DNA sequences is from 5’ to 3’. Sequencing Service for Samples from Genetic Screens. Allele: An allele (pronounced UH-leel is one of multiple alternative forms of a single gene, each of which is a viable DNA sequence occupying a given position, or locus on a chromosome. Genetic Algorithm (GA) is a search-based optimization technique based on the principles of Genetics and Natural Selection. These methods, and technologies such as DNA fingerprinting, have also transformed forensic science. Plus DNA contains more information, which can make more accurate trees. These modifications do not change the DNA sequence, but instead, they affect how cells "read" genes. Samples should be submitted in 1.5ml or 0.5ml microfuge tubes with the appropriate amount of template and primer. High-throughput sequencing of the 16S rRNA gene on the Illumina platform is commonly used to assess microbial diversity in environmental samples. This DNA is transcribed into a related molecule, RNA, which is then translated into proteins. Sturtevant and Beadle, in their 1939 textbook, used an example from Drosophila to show how gene order can be determined unambiguously simply by inspection of 3-point data (as in the tables below). Your doctor may suggest a diagnostic genetic test if you have a medical problem. Mutations lead to genetic variation by altering genes and alleles in a population. Chaos Game Representation is a graphical representation of a sequence. Examples of Genetic Characteristics. Next-Generation Sequencing (NGS) technologies have dramatically revolutionised research in many fields of genetics. Here is the BRCA2 promoter sequence aligned to BRAC2 gene. The starting point is frequently a large-insert genomic clone with a known physical map location. $ 7.95. A gene is an ordered sequence of nucleotides located on a particular position on a particular chromosome that encodes a specific functional protein. are usually several thousand nucleotides long. An example of a student response may be: “DNA sequence provides the code for the amino acid sequence. A larger dif-ference indicates a higher diversity in the 16S rRNA gene sequencing data. Whole genome sequencing is the mapping out of a person’s unique DNA. Chain termination sequencing is the standard method for the determination of nucleotide sequence. The locus name was originally designed to help group entries with similar sequences: the first three characters usually designated the organism; the fourth and fifth characters were used to show other group designations, such as gene product; for segmented entries, the last character was one of a series of sequential … “DNA sequencing is a method used for determining the sequence and order of nucleotides present in particular DNA sequence.” DNA sequencing methods available nowadays are quite accurate, fast and reliable.. For High Throughput orders, please submit samples in 96 well plates or strip tubes with DETACHABLE caps. Restriction Fragment Length Polymorphism (RFLP) 2. The little numbers show sequence collected over time. The sequence is not that of one person, but is a composite derived from several individuals. Proteomics, therefore, is a similar large-scale analysis of all the proteins in an organism, tissue type, or cell (called the proteome). This is a unique number that is only associated with one sequence. According to the World Health Organization, the number of confirmed cases globally reached 2.9 million An example of this is a panel to test for mutations in the MLH1, MSH2, MSH6, PMS2 and EPCAM genes. Gene or genome sequencing is a process of decoding the genomes that make up an organism’s DNA or RNA, types of nucleic acid that store genetic information. In this example… Examination of the most dis-similar samples … It is a novel holistic approach that provides a visual image of a DNA sequence quite different from the traditional linear arrangement of nucleotides. The genetic code is the sequence of nucleotide bases in nucleic acids ( DNA and RNA) that code for amino acid chains in proteins. All customers: if your institution has a custom price, that price will be displayed in the cart after logging in. Viral emergence. For instance, recombination between two similar genes that are several million bp apart can lead to deletion of the intervening genes in somatic cells. New and enhanced features for all of your DNA sequence analysis. One sequence entry starts with an identifier line ("ID "), followed by further annotation lines. Often, gene variants that could cause a genetic disorder are repaired by certain enzymes before the gene is expressed and an altered protein is produced. RNA sequencing (RNA-Seq) is a technique where RNA is sequenced by next generation sequencing ( Chu and Corey, 2012 ). 1. For months, scientists have been sounding alarms and trying to ramp up genetic sequencing of test samples, but the effort has been plagued by … Please see this article and our software support site for more information. Variations in the sequence of genes during can have important consequences and cause disease. A summary of the available data is shown below. The DNA sequence of genes carries the instructions, or code, for building proteins. The very first human genome was completed in 2003 as part of the Human Genome Project, which was formally started in 1990. Thus, the FHIR Sequence resource avoids large genomic payloads in a manner analogous to how the FHIR ImagingStudy resource references large images maintained in other systems. Capillary Gel Electrophoresis: In these systems, slab gel electrophoresis is replaced by capillary gel … Some is still unknown or uncertain. Glycerol stock. What is a DNA profile? Three "stop" codons mark the end of a protein. It is also being used to monitor different mutations of the virus. Lindegren (1936) used 3-point ascus data to construct the first genetic map Repeated culture reduces within-sample Mycobacterium tuberculosis genetic diversity due to selection of clones suited to growth in culture and/or random loss of lineages, but it is not known to what extent omitting the culture step altogether alters genetic diversity. How genetic sequencing maps the coronavirus. For example, in humans, one allele of the eye-color gene produces blue eyes and another allele of the eye-color gene produces brown eyes. A gene mutation is defined as an alteration in the sequence of nucleotides in DNA. Genetics is the study of biological features -- or traits -- that are inherited from parent to child. Answer: For new sample types, we recommend sequencing a minimum of 20,000 read pairs/cell for Single Cell 3' v3/v3.1/v3.1 LT and Single Cell 5' v1.1/v2 gene expression libraries. The start of the sequence is marked by a line containing "ORIGIN" and the end of the sequence is marked by two slashes ("//"). STRs are found at different places or genetic loci in a person’s DNA. Over the last 56 years, researchers have been developing methods and technologies to assist in the determination of nucleic acid sequences in biological samples. The codon is read in a 5´ to 3´ direction. Genes are the molecular unit of heredity. The exome accounts for only 1 – 2% of the whole genome making WGS the most comprehensive test for your patient. DNA Mutation: A mutation is a change in the DNA sequence. Using short-read sequencing technologies, data sets containing large numbers of short blocks can easily be obtained for any organism, for example in the form of low-coverage fragmented genome assemblies, restriction site associated DNA (RAD), or transcriptome data (e.g., Davey et al. During whole genome sequencing, researchers collect a DNA sample and then determine the identity of the 3 billion nucleotides that compose the human genome. For example, Down syndrome (sometimes referred to as " Down's syndrome ") or trisomy 21 is a common genetic disorder that occurs when a person has three copies of chromosome 21. for you. This article discusses what next-generation sequencing (NGS) is, advances in the technology and its applications. Furthermore, we show that using a targeted sequencing approach is an efficient mechanism for enhancing the detection of gene fusions compared to standard RNA sequencing suggesting that even samples that have been deeply sequenced by standard RNA sequencing methods would benefit from a targeted approach to identifying gene fusion events. Each three letter codon encodes either an amino acid or tells the ribosome to stop translation. Complete genetic sequence information, of which specific genetic variations are a part, is reported by reference to the GA4GH repository. Users can set up and run Cell Ranger pipelines through Cloud Analysis. The ability to sequence many individuals from one or multiple populations at a genomic scale has greatly enhanced population genetics studies and made it a data-driven discipline. Different methods of DNA sequencing:Maxam and Gilbert methodChain termination methodsemiautomated methodautomated methodPyrosequencingThe whole-genome shotgun sequencing methodClone by the clone sequencing methodNext-generation sequencing method The Mc1r gene codes for the melanocortin 1 … It’s pretty cheap and easy now to get DNA sequences. The Genetic Code is used to translate from mRNA into protein. But if you need to sequence an entire genome (or a lot of samples), NGS may be the more cost-effective choice. Promoting genome sequencing and genotyping research, facilitating the construction and improvement of agri-genomic databases, and accelerating the breeding and improvement of crops and livestock. The 24 available samples, including from Thailand and Shenzhen as well as Wuhan, show “very limited genetic variation,” Rambaut concluded on … Molecular markers are DNA sequences, whose inheritance pattern can be established. Based on the big data and cloud computing technologies, it provides data services such as archive, analysis, knowledge search, management authorization, and visualization. 3 Researchers have begun to evaluate the molecular genetics of the virus, specifically how SARS-CoV-2 targets host tissues and gene expression in cells. Random Protein Sequence generates a random sequence of the length you specify. CDS = a coding sequence, or region of nucleotides that corresponds with amino acids in a protein. It may be: • a change in the total number of chromosomes in a cell. An example sequence in EMBL format is: ID AA03518 standard; DNA; FUN; 237 BP. Using the technique of Holley and Walter Fieser, they sequenced the genome of bacteriophage MS2 (RNA sequencing). The 16s rRNA gene (1,500 bp) is large enough for informatics purposes. One "start" codon, AUG, marks the beginning of a protein and also encodes the amino acid methionine. To construct a tree, we’ll compare the DNA sequences of different species. Thus, if the concentration of plasmid A is 25ng/ul, you must send us 20ul. Starting with a nucleotide sequence for a human gene, this example uses alignment algorithms to locate and verify a corresponding gene in a model organism. Some examples of sequence motifs are: the C/D and H/ACA boxes of snoRNAs, Sm binding site found in spliceosomal RNAs such as U1, U2, U4, U5, U6, U12 and U3, the Shine-Dalgarno sequence, the Kozak consensus sequence and the RNA polymerase III terminator. Image Courtesy of National Human Genome Research Institute. Open reading frames are highlighted in red. The organizers of the Emirati Genome Program revealed that they sought to collect one million DNA samples, develop a genetic map for individuals and combine it with health data to provide distinguished health care for citizens based on the results of the genetic sequencing examination of UAE citizens, using the latest sequencing technologies. Most codons specify an amino acid. Direct submission to ExPASy tools Sequence analysis tools ProtParam ProtScale Compute pI/Mw PeptideMass PeptideCutter Download Fasta Text. A mutation can change the sequence to TTC in some people. required , Sample Type is required. ­In the h­uman genome, there are 50,000 to 100,000 genes. For example, to find the number of occurrences of DNA words that are 1 nucleotide long in the sequence dengueseq, we type: > count ( dengueseq , 1 ) a c g t 3426 2240 2770 2299 As expected, this gives us the number of occurrences of the individual nucleotides. Sample Type. DNA consists of the four nucleotide bases: adenine (A), guanine (G), cytosine (C) and thymine (T). The RefSeqGene record is always going to start at "1," in our example for MC1R, the gene feature the gene will start at "5984." One way to produce a DNA profile, is for scientists to examine STRs at 10 or more genetic loci. We were very pleased with this collaboration and wish to continue it. The read 1 sequence would happen first, then the two indices (I7 and I5), and then the Read 2 last. RNA contains the nucleotides adenine, guanine, cytosine and uracil (U). The index sequences would “tell” the system what sample those sequences belonged to. DNA sequences are only one line of evidence illuminating evolutionary relationships. Diagnostic genetic testing can usually work out if you have a specific genetic condition that your provider is concerned about. October 22, 2020 - Genetic sequencing can help monitor mutations in COVID-19, potentially improving diagnostic testing and transmission tracking, a study published in Cell Reports revealed. Gene-sequencing companies: These companies market systems to researchers that can be used to sequence genes using short- or long-read technology. With reports like hair photobleaching and freckles, learn how your DNA can influence your physical features. change a codon to one that encodes the same amino acid and causes no change in the protein produced. MDB. Gene expression refers to how often or when proteins are created from the instructions within your genes. A single sequence generated by NGS methods will be 100-200 bases long. Plasmid. DNA sequencing is the process of determining the nucleic acid sequence – the order of nucleotides in DNA.It includes any method or technology that is used to determine the order of the four bases: adenine, guanine, cytosine, and thymine.The advent of rapid DNA sequencing methods has greatly accelerated biological and medical research and discovery. Since there are only four nucleotide "letters" in the DNA alphabet (A, C, G, T, which stand for adenine, cytosine, guanine, and thymine), but there are 20 different amino acids in the protein alphabet, it is clear that more than one nucleotide must be used to specify an amino acid. Figure 1. gBlocks Gene Fragments can be added to a human DNA sample before library preparation, target enrichment and sequencing. China National GeneBank DataBase (CNGBdb) is an unified platform built for biological big data sharing and application services to the research community. such as Drosophila and maize. Both the forward and reverse complement sequences are listed for the i5 sequence. To find the cause of a disease, the lab can use different ways to look at all or part of your DNA. Gene sequencing studies, like that done for the human genome project, have revealed that at the nucleotide level, the gene encoding a specific protein can have a number of differences in sequence. For example, for the DEN-1 Dengue virus genome sequence, we know from using the table() function above that the genome contains 3426 As, 2240 Cs, 2770 Gs and 2299 Ts. Standard Sequencing Services. BLAST can be used to infer functional and evolutionary relationships between sequences as well as help identify members of gene families. Removal of Dead Cells from Single Cell Suspensions Improves Performance for 10x Genomics® Single Cell Applications. Sequencing tests read your DNA and look for variants (changes) in the DNA. Resolving Cell Types as a Function of Read Depth and Cell Number. Question: What is the recommended sequencing depth for Si ngle Cell 3' and 5' Gene Expression libraries?. This name refers to the unique organization of short, partially palindromic repeated DNA For example, the accession number NC_001477 is for the DEN-1 Dengue virus genome sequence. Based on genetic sequencing of samples of the virus, scientists think that HIV, or human immunodeficiency virus, first found a …

Strategies To Stop Drinking Alcohol, Liquid Solutions Examples, New Sonic Video Game 2021, Baskin-robbins Cotton Candy Cake, Software Inc Release Date, Espn Fantasy Basketball Playoff Tiebreaker Categories,

Leave a Reply

Your email address will not be published. Required fields are marked *